Module Registry

Collection modules = 
  Lookup.getDefault().lookupAll(ModuleInfo.class);

• ModuleInfo class
  
  
  
  • The module system provides a ModuleInfo class for each module, where all information about modules is stored.
    
  • The ModuleInfo objects are available centrally via the Lookup, and can be obtained there as above.
  
  
• Information List / getAttribute():
  
  
  
  • name
    
  • version
    
  • dependencies
    
  • current status (activated or deactivated)
    
  • the existence of service implementations for the current module
  
  
• Being informed of changes / PropertyChangeListener
  
• LookupListener
  
  
  
  • Informs you of the installation and uninstallation of modules

Lookup.Result res = Lookup.getDefault().lookupResult(ModuleInfo.class);
result.addLookupListener(new LookupListener() {
  public void resultChanged(LookupEvent lookupEvent) {
    Collection c = res.allInstances();
    System.out.println("Available modules: " + c.size());
  }
});
res.allItems(); //initialize the listener